Examples of org.apache.lucene.util.BitVector

org.apache.lucene.util.BitVector
Optimized implementation of a vector of bits. This is more-or-less like java.util.BitSet, but also includes the following:
- a count() method, which efficiently computes the number of one bits;
- optimized read from and write to disk;
- inlinable get() method;
- store and load, as bit set or d-gaps, depending on sparseness;


    tis = new TermInfosReader(cfsDir, segment, fieldInfos);


    // NOTE: the bitvector is stored using the regular directory, not cfs
    if (hasDeletions(si))
      deletedDocs = new BitVector(directory(), segment + ".del");


    // make sure that all index files have been read or are kept open
    // so that if an index update removes them we'll still have them
    freqStream = cfsDir.openFile(segment + ".frq");
    proxStream = cfsDir.openFile(segment + ".prx");

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    return si.dir.fileExists(si.name + ".cfs");
  }


  protected final synchronized void doDelete(int docNum) throws IOException {
    if (deletedDocs == null)
      deletedDocs = new BitVector(maxDoc());
    deletedDocsDirty = true;
    deletedDocs.set(docNum);
  }

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  }


  private void loadDeletedDocs() throws IOException {
    // NOTE: the bitvector is stored using the regular directory, not cfs
    if (hasDeletions(si)) {
      deletedDocs = new BitVector(directory(), si.getDelFileName());
      deletedDocsRef = new Ref();
      assert checkDeletedCounts();
    } else
      assert si.getDelCount() == 0;
  }

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  }


  @Override
  protected void doDelete(int docNum) {
    if (deletedDocs == null) {
      deletedDocs = new BitVector(maxDoc());
      deletedDocsRef = new Ref();
    }
    // there is more than 1 SegmentReader with a reference to this
    // deletedDocs BitVector so decRef the current deletedDocsRef,
    // clone the BitVector, create a new deletedDocsRef

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                                                                 pendingDeletes);
      // Apply delete-by-docID now (delete-byDocID only
      // happens when an exception is hit processing that
      // doc, eg if analyzer has some problem w/ the text):
      if (pendingDeletes.docIDs.size() > 0) {
        flushState.deletedDocs = new BitVector(numDocs);
        for(int delDocID : pendingDeletes.docIDs) {
          flushState.deletedDocs.set(delDocID);
        }
        pendingDeletes.bytesUsed.addAndGet(-pendingDeletes.docIDs.size() * BufferedDeletes.BYTES_PER_DEL_DOCID);
        pendingDeletes.docIDs.clear();

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  }


  private void loadDeletedDocs() throws IOException {
    // NOTE: the bitvector is stored using the regular directory, not cfs
    if (hasDeletions(si)) {
      deletedDocs = new BitVector(directory(), si.getDelFileName());
      deletedDocsRef = new AtomicInteger(1);
      assert checkDeletedCounts();
      if (deletedDocs.size() != si.docCount) {
        throw new CorruptIndexException("document count mismatch: deleted docs count " + deletedDocs.size() + " vs segment doc count " + si.docCount + " segment=" + si.name);
      }

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  }


  @Override
  protected void doDelete(int docNum) {
    if (deletedDocs == null) {
      deletedDocs = new BitVector(maxDoc());
      deletedDocsRef = new AtomicInteger(1);
    }
    // there is more than 1 SegmentReader with a reference to this
    // deletedDocs BitVector so decRef the current deletedDocsRef,
    // clone the BitVector, create a new deletedDocsRef

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            if (minState.docID < delDocLimit) {
              // Mark it deleted.  TODO: we could also skip
              // writing its postings; this would be
              // deterministic (just for this Term's docs).
              if (state.deletedDocs == null) {
                state.deletedDocs = new BitVector(state.numDocs);
              }
              state.deletedDocs.set(minState.docID);
            }


            final ByteSliceReader prox = minState.prox;

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      tis = new TermInfosReader(cfsDir, segment, fieldInfos);
      
      // NOTE: the bitvector is stored using the regular directory, not cfs
      if (hasDeletions(si)) {
        deletedDocs = new BitVector(directory(), si.getDelFileName());


        // Verify # deletes does not exceed maxDoc for this segment:
        if (deletedDocs.count() > maxDoc()) {
          throw new IllegalStateException("number of deletes (" + deletedDocs.count() + ") exceeds max doc (" + maxDoc() + ") for segment " + si.name);
        }

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    return si.hasSeparateNorms();
  }


  protected void doDelete(int docNum) {
    if (deletedDocs == null)
      deletedDocs = new BitVector(maxDoc());
    deletedDocsDirty = true;
    undeleteAll = false;
    deletedDocs.set(docNum);
  }

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